ESDU TM 173:2013
$22.75
Material Damping of Metals and Alloys
| Published By | Publication Date | Number of Pages |
| ESDU | 2013-05 | 62 |
This Memorandum is concerned with the material damping of metals
and their alloys. It may be considered to provide background
information for ESDU 09006. Damping from external factors, such as
lubrication, riveted joints and viscoelastic additions to the
structure, are excluded from consideration. In the Item the main
energy dissipation mechanisms responsible for material damping are
presented. The first part of the Item is devoted to linear material
damping, which is amplitude-independent but frequency-dependent.
Most processes responsible for linear damping are relaxation
processes, such as macroscopic and microscopic thermoelastic
relaxations, point-defect relaxations and relaxations due to
dislocations and grain boundary viscosity. Thermoelastic damping is
present in all metals and alloys. However, it can only be
identified at low frequencies, since at higher frequencies metals
have damping which varies little with frequency. With some
exceptions linear damping does not provide high values of loss
factors. Nonlinear damping in metals and alloys is
amplitude-dependent and frequency-independent. The main mechanisms
responsible for nonlinear damping are associated with
amplitude-dependent dislocations, magnetostriction, the
heterogeneous structure of materials and phase transformations, all
of which can give rise to relatively high damping with SDC values
above 10%.
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